+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   74503 Madola (1999 DN4) Classification: Main-belt Asteroid          SPK-ID: 2074503 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 15 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1836510223836328 7.5593e-08   a 3.013950928942282 2.3769e-08 au q 2.460435759427932 2.2621e-07 au i 17.17537999593846 9.64e-06 deg node 356.9776038748563 1.7844e-05 deg peri 201.1329224967978 2.7044e-05 deg M 351.7163554320975 1.7539e-05 deg tp 2459044.476599851537 (2020-Jul-13.97659985) 9.315e-05 TDB period 1911.184843432039 5.23 2.2608e-05 6.19e-08 d yr n .1883648257452296 2.2282e-09 deg/d Q 3.567466098456631 2.8134e-08 au   Orbit Determination Parameters    # obs. used (total)      386      data-arc span      9547 days (26.14 yr)      first obs. used      1994-04-02      last obs. used      2020-05-22      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55141      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 21:43:25   Additional Information  Earth MOID = 1.46758 au   Jupiter MOID = 1.43537 au   T_jup = 3.156  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.2   n/a MPO422175   diameter diameter 4.481 km 0.179 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.085   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   74503 Madola           Discovered 1999 Feb. 23 by D. Bergeron at Val-des-Bois. Christian Marois (b. 1974), René Doyon (b. 1963) and David Lafrenière (b. 1978) developed instruments that allowed seeing an extrasolar planetary system. Doyon was director of the Mt. Mégantic Observatory; Marois and Lafrenière were postdoctoral fellows at the Herzberg Institute and the University of Toronto. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20090409/MPCPages.arc Last Updated: 2009-04-10 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-23 17:44 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin